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<title>class Zlib::Deflate - zlib: Ruby Standard Library Documentation</title>


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  <h3>Parent</h3>

  <p class="link"><a href="ZStream.html">Zlib::ZStream</a>
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-deflate">::deflate</a>
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-3C-3C">#&lt;&lt;</a>
    <li ><a href="#method-i-deflate">#deflate</a>
    <li ><a href="#method-i-flush">#flush</a>
    <li ><a href="#method-i-initialize_copy">#initialize_copy</a>
    <li ><a href="#method-i-params">#params</a>
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    <main role="main" aria-labelledby="class-Zlib::Deflate">
    <h1 id="class-Zlib::Deflate" class="class">
      class Zlib::Deflate
    </h1>

    <section class="description">
    
<p><a href="Deflate.html"><code>Zlib::Deflate</code></a> is the class for compressing data.  See <a href="ZStream.html"><code>Zlib::ZStream</code></a> for more information.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-deflate" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          deflate(string[, level])
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          Zlib::Deflate.deflate(string[, level])
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Compresses the given <code>string</code>. Valid values of level are Zlib::NO_COMPRESSION, Zlib::BEST_SPEED, Zlib::BEST_COMPRESSION, Zlib::DEFAULT_COMPRESSION, or an integer from 0 to 9.</p>

<p>This method is almost equivalent to the following code:</p>

<pre class="ruby"><span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">deflate</span>(<span class="ruby-identifier">string</span>, <span class="ruby-identifier">level</span>)
  <span class="ruby-identifier">z</span> = <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">Deflate</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">level</span>)
  <span class="ruby-identifier">dst</span> = <span class="ruby-identifier">z</span>.<span class="ruby-identifier">deflate</span>(<span class="ruby-identifier">string</span>, <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">FINISH</span>)
  <span class="ruby-identifier">z</span>.<span class="ruby-identifier">close</span>
  <span class="ruby-identifier">dst</span>
<span class="ruby-keyword">end</span>
</pre>

<p>See also <a href="../Zlib.html#method-c-inflate"><code>Zlib.inflate</code></a></p>

                              <div class="method-source-code" id="deflate-source">
            <pre>static VALUE
rb_deflate_s_deflate(int argc, VALUE *argv, VALUE klass)
{
    struct zstream z;
    VALUE src, level, dst, args[2];
    int err, lev;

    rb_scan_args(argc, argv, &quot;11&quot;, &amp;src, &amp;level);

    lev = ARG_LEVEL(level);
    StringValue(src);
    zstream_init_deflate(&amp;z);
    err = deflateInit(&amp;z.stream, lev);
    if (err != Z_OK) {
        raise_zlib_error(err, z.stream.msg);
    }
    ZSTREAM_READY(&amp;z);

    args[0] = (VALUE)&amp;z;
    args[1] = src;
    dst = rb_ensure(deflate_run, (VALUE)args, zstream_ensure_end, (VALUE)&amp;z);

    return dst;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-new" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          Zlib::Deflate.new(level=DEFAULT_COMPRESSION, window_bits=MAX_WBITS, mem_level=DEF_MEM_LEVEL, strategy=DEFAULT_STRATEGY)
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a new deflate stream for compression. If a given argument is nil, the default value of that argument is used.</p>

<p>The <code>level</code> sets the compression level for the deflate stream between 0 (no compression) and 9 (best compression). The following constants have been defined to make code more readable:</p>
<ul><li>
<p>Zlib::DEFAULT_COMPRESSION</p>
</li><li>
<p>Zlib::NO_COMPRESSION</p>
</li><li>
<p>Zlib::BEST_SPEED</p>
</li><li>
<p>Zlib::BEST_COMPRESSION</p>
</li></ul>

<p>See <a href="http://www.zlib.net/manual.html#Constants">www.zlib.net/manual.html#Constants</a> for further information.</p>

<p>The <code>window_bits</code> sets the size of the history buffer and should be between 8 and 15.  Larger values of this parameter result in better compression at the expense of memory usage.</p>

<p>The <code>mem_level</code> specifies how much memory should be allocated for the internal compression state.  1 uses minimum memory but is slow and reduces compression ratio while 9 uses maximum memory for optimal speed.  The default value is 8. Two constants are defined:</p>
<ul><li>
<p>Zlib::DEF_MEM_LEVEL</p>
</li><li>
<p>Zlib::MAX_MEM_LEVEL</p>
</li></ul>

<p>The <code>strategy</code> sets the deflate compression strategy.  The following strategies are available:</p>
<dl class="rdoc-list note-list"><dt>Zlib::DEFAULT_STRATEGY
<dd>
<p>For normal data</p>
</dd><dt>Zlib::FILTERED
<dd>
<p>For data produced by a filter or predictor</p>
</dd><dt>Zlib::FIXED
<dd>
<p>Prevents dynamic Huffman codes</p>
</dd><dt>Zlib::HUFFMAN_ONLY
<dd>
<p>Prevents string matching</p>
</dd><dt>Zlib::RLE
<dd>
<p>Designed for better compression of PNG image data</p>
</dd></dl>

<p>See the constants for further description.</p>

<h2 id="method-c-new-label-Examples">Examples<span><a href="#method-c-new-label-Examples">&para;</a> <a href="#top">&uarr;</a></span></h2>

<h3 id="method-c-new-label-Basic">Basic<span><a href="#method-c-new-label-Basic">&para;</a> <a href="#top">&uarr;</a></span></h3>

<pre class="ruby"><span class="ruby-identifier">open</span> <span class="ruby-string">&quot;compressed.file&quot;</span>, <span class="ruby-string">&quot;w+&quot;</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">io</span><span class="ruby-operator">|</span>
  <span class="ruby-identifier">io</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">Deflate</span>.<span class="ruby-identifier">new</span>.<span class="ruby-identifier">deflate</span>(<span class="ruby-constant">File</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">&quot;big.file&quot;</span>))
<span class="ruby-keyword">end</span>
</pre>

<h3 id="method-c-new-label-Custom+compression">Custom compression<span><a href="#method-c-new-label-Custom+compression">&para;</a> <a href="#top">&uarr;</a></span></h3>

<pre class="ruby"><span class="ruby-identifier">open</span> <span class="ruby-string">&quot;compressed.file&quot;</span>, <span class="ruby-string">&quot;w+&quot;</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">compressed_io</span><span class="ruby-operator">|</span>
  <span class="ruby-identifier">deflate</span> = <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">Deflate</span>.<span class="ruby-identifier">new</span>(<span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">BEST_COMPRESSION</span>,
                              <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">MAX_WBITS</span>,
                              <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">MAX_MEM_LEVEL</span>,
                              <span class="ruby-constant">Zlib</span><span class="ruby-operator">::</span><span class="ruby-constant">HUFFMAN_ONLY</span>)

  <span class="ruby-keyword">begin</span>
    <span class="ruby-identifier">open</span> <span class="ruby-string">&quot;big.file&quot;</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">big_io</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">until</span> <span class="ruby-identifier">big_io</span>.<span class="ruby-identifier">eof?</span> <span class="ruby-keyword">do</span>
        <span class="ruby-identifier">compressed_io</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">zd</span>.<span class="ruby-identifier">deflate</span>(<span class="ruby-identifier">big_io</span>.<span class="ruby-identifier">read</span>(<span class="ruby-value">16384</span>))
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">ensure</span>
    <span class="ruby-identifier">deflate</span>.<span class="ruby-identifier">close</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
</pre>

<p>While this example will work, for best optimization review the flags for your specific time, memory usage and output space requirements.</p>

                              <div class="method-source-code" id="new-source">
            <pre>static VALUE
rb_deflate_initialize(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z;
    VALUE level, wbits, memlevel, strategy;
    int err;

    rb_scan_args(argc, argv, &quot;04&quot;, &amp;level, &amp;wbits, &amp;memlevel, &amp;strategy);
    TypedData_Get_Struct(obj, struct zstream, &amp;zstream_data_type, z);

    err = deflateInit2(&amp;z-&gt;stream, ARG_LEVEL(level), Z_DEFLATED,
                       ARG_WBITS(wbits), ARG_MEMLEVEL(memlevel),
                       ARG_STRATEGY(strategy));
    if (err != Z_OK) {
        raise_zlib_error(err, z-&gt;stream.msg);
    }
    ZSTREAM_READY(z);

    return obj;
}</pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-3C-3C" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          &lt;&lt; string
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Inputs <code>string</code> into the deflate stream just like <a href="Deflate.html#method-i-deflate"><code>Zlib::Deflate#deflate</code></a>, but returns the <a href="Deflate.html"><code>Zlib::Deflate</code></a> object itself.  The output from the stream is preserved in output buffer.</p>

                              <div class="method-source-code" id="3C-3C-source">
            <pre>static VALUE
rb_deflate_addstr(VALUE obj, VALUE src)
{
    do_deflate(get_zstream(obj), src, Z_NO_FLUSH);
    return obj;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-deflate" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          deflate(string, flush = Zlib::NO_FLUSH)                 &rarr; String
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          deflate(string, flush = Zlib::NO_FLUSH) { |chunk| ... } &rarr; nil
                              </span>
                            </div>

                            <div class="method-description">
                              <p>Inputs <code>string</code> into the deflate stream and returns the output from the stream.  On calling this method, both the input and the output buffers of the stream are flushed.  If <code>string</code> is nil, this method finishes the stream, just like <a href="ZStream.html#method-i-finish"><code>Zlib::ZStream#finish</code></a>.</p>

<p>If a block is given consecutive deflated chunks from the <code>string</code> are yielded to the block and <code>nil</code> is returned.</p>

<p>The <code>flush</code> parameter specifies the flush mode.  The following constants may be used:</p>
<dl class="rdoc-list note-list"><dt>Zlib::NO_FLUSH
<dd>
<p>The default</p>
</dd><dt>Zlib::SYNC_FLUSH
<dd>
<p>Flushes the output to a byte boundary</p>
</dd><dt>Zlib::FULL_FLUSH
<dd>
<p>SYNC_FLUSH + resets the compression state</p>
</dd><dt>Zlib::FINISH
<dd>
<p>Pending input is processed, pending output is flushed.</p>
</dd></dl>

<p>See the constants for further description.</p>

                              <div class="method-source-code" id="deflate-source">
            <pre>static VALUE
rb_deflate_deflate(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z = get_zstream(obj);
    VALUE src, flush;

    rb_scan_args(argc, argv, &quot;11&quot;, &amp;src, &amp;flush);
    do_deflate(z, src, ARG_FLUSH(flush));

    return zstream_detach_buffer(z);
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-flush" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          flush(flush = Zlib::SYNC_FLUSH)                 &rarr; String
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>
                      <div class="method-heading">
                        <span class="method-callseq">
                          flush(flush = Zlib::SYNC_FLUSH) { |chunk| ... } &rarr; nil
                              </span>
                            </div>

                            <div class="method-description">
                              <p>This method is equivalent to <code>deflate(&#39;&#39;, flush)</code>. This method is just provided to improve the readability of your Ruby program.  If a block is given chunks of deflate output are yielded to the block until the buffer is flushed.</p>

<p>See <a href="Deflate.html#method-i-deflate"><code>Zlib::Deflate#deflate</code></a> for detail on the <code>flush</code> constants NO_FLUSH, SYNC_FLUSH, FULL_FLUSH and FINISH.</p>

                              <div class="method-source-code" id="flush-source">
            <pre>static VALUE
rb_deflate_flush(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z = get_zstream(obj);
    VALUE v_flush;
    int flush;

    rb_scan_args(argc, argv, &quot;01&quot;, &amp;v_flush);
    flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH);
    if (flush != Z_NO_FLUSH) {  /* prevent Z_BUF_ERROR */
        zstream_run(z, (Bytef*)&quot;&quot;, 0, flush);
    }

    return zstream_detach_buffer(z);
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-initialize_copy" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">initialize_copy</span><span
                                class="method-args">(p1)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Duplicates the deflate stream.</p>

                              <div class="method-source-code" id="initialize_copy-source">
            <pre>static VALUE
rb_deflate_init_copy(VALUE self, VALUE orig)
{
    struct zstream *z1, *z2;
    int err;

    TypedData_Get_Struct(self, struct zstream, &amp;zstream_data_type, z1);
    z2 = get_zstream(orig);

    if (z1 == z2) return self;
    err = deflateCopy(&amp;z1-&gt;stream, &amp;z2-&gt;stream);
    if (err != Z_OK) {
        raise_zlib_error(err, 0);
    }
    z1-&gt;input = NIL_P(z2-&gt;input) ? Qnil : rb_str_dup(z2-&gt;input);
    z1-&gt;buf   = NIL_P(z2-&gt;buf)   ? Qnil : rb_str_dup(z2-&gt;buf);
    z1-&gt;flags = z2-&gt;flags;

    return self;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-params" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          params(level, strategy)
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Changes the parameters of the deflate stream to allow changes between different types of data that require different types of compression.  Any unprocessed data is flushed before changing the params.</p>

<p>See <a href="Deflate.html#method-c-new"><code>Zlib::Deflate.new</code></a> for a description of <code>level</code> and <code>strategy</code>.</p>

                              <div class="method-source-code" id="params-source">
            <pre>static VALUE
rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy)
{
    struct zstream *z = get_zstream(obj);
    int level, strategy;
    int err;
    uInt n;
    long filled;

    level = ARG_LEVEL(v_level);
    strategy = ARG_STRATEGY(v_strategy);

    n = z-&gt;stream.avail_out;
    err = deflateParams(&amp;z-&gt;stream, level, strategy);
    filled = n - z-&gt;stream.avail_out;
    while (err == Z_BUF_ERROR) {
        rb_warning(&quot;deflateParams() returned Z_BUF_ERROR&quot;);
        zstream_expand_buffer(z);
        rb_str_set_len(z-&gt;buf, RSTRING_LEN(z-&gt;buf) + filled);
        n = z-&gt;stream.avail_out;
        err = deflateParams(&amp;z-&gt;stream, level, strategy);
        filled = n - z-&gt;stream.avail_out;
    }
    if (err != Z_OK) {
        raise_zlib_error(err, z-&gt;stream.msg);
    }
    rb_str_set_len(z-&gt;buf, RSTRING_LEN(z-&gt;buf) + filled);

    return Qnil;
}</pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-set_dictionary" class="method-detail ">
                      <div class="method-heading">
                        <span class="method-callseq">
                          set_dictionary(string)
                              </span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Sets the preset dictionary and returns <code>string</code>. This method is available just only after <a href="Deflate.html#method-c-new"><code>Zlib::Deflate.new</code></a> or <a href="ZStream.html#method-i-reset"><code>Zlib::ZStream#reset</code></a> method was called. See zlib.h for details.</p>

<p>Can raise errors of Z_STREAM_ERROR if a parameter is invalid (such as NULL dictionary) or the stream state is inconsistent, Z_DATA_ERROR if the given dictionary doesn’t match the expected one (incorrect adler32 value)</p>

                              <div class="method-source-code" id="set_dictionary-source">
            <pre>static VALUE
rb_deflate_set_dictionary(VALUE obj, VALUE dic)
{
    struct zstream *z = get_zstream(obj);
    VALUE src = dic;
    int err;

    StringValue(src);
    err = deflateSetDictionary(&amp;z-&gt;stream,
                               (Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src));
    if (err != Z_OK) {
        raise_zlib_error(err, z-&gt;stream.msg);
    }

    return dic;
}</pre>
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    var cookieName = 'darkmode';
    var cssDarkmode = Cookies.get(cookieName);
    console.log("***** swapMode! " + cssDarkmode + " *****");


    if (cssDarkmode == "true") {
      console.log("We have dark mode, set the css to light ...");
      $('#rdoccss').attr("href", defaultModeCssHref);
      $('#cssSelect').text("Dark mode");
      cssDarkmode = "false";
      console.log("swapMode! Now set cookie to " + cssDarkmode);
      Cookies.set(cookieName, cssDarkmode);

    } else {
      console.log("We not have dark mode, set the css to dark ...");
      $('#rdoccss').attr("href", darkModeCsseHref);
      $('#cssSelect').text("Light mode");
      cssDarkmode = "true";
      console.log("swapMode! Now set cookie to " + cssDarkmode);
      Cookies.set(cookieName, cssDarkmode);

    }

    console.log("  --------------- ");
  }


const vueCssApp = new Vue({
el: '#menubar',
data: {
isDark: false
},
methods: {
toggleClass: function(event){
this.isDark = !this.isDark;
}
}
})

const vueApp = new Vue({
el: '#vapp',
data: { 
isOpen: true
},

mounted() {
this.handleResize();
this.manage_mob_classes();
window.addEventListener('resize', this.handleResize)
//this.isOpen !=  (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent));
},
destroyed() {
window.removeEventListener('resize', this.handleResize)
},
created() {
//manage_mob_classes();
},

methods : {
isMobile() {
  return (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent));
},

  handleResize() {
    if (!this.isMobile()) {
      this.isOpen = window.innerWidth > 800;
    }
  },

  manage_mob_classes() {
    if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
      $("nav").addClass("mob_nav");
      $("main").addClass("mob_main");
      $("#extraz").addClass("mob_extraz");
      $("#carbonads-container").addClass("mob_carbonads-container");
      this.isOpen  = false;
    } else {
      $("nav").removeClass("mob_nav") 
        $("main").removeClass("mob_main");
      $("#extraz").removeClass("mob_extraz");
      $("#carbonads-container").removeClass("mob_carbonads-container");
      this.isOpen  = true;
    }
  },

  toggleNav() {
    this.isOpen =! this.isOpen ;
    // alert("Toggle nav!");
    console.log("toggleNav() click: " + this.isOpen );
  }
}
})

$("#carbonads-container").append(ads);


$(function() {

    var darkmode = Cookies.get("darkmode");
    console.log("Document ready: " + darkmode);

    if ( darkmode  == "true" ) {
      $('#cssSelect').text("Light mode");
    } else {
      $('#cssSelect').text("Dark mode");
     }

    $('body').css('display','block');
    });

</script>

    
  </body> 
</html>

